Page 36 - COSMOS & H -Health - Science

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What are Black Holes?
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W W h a t a r e B l l a c k H o l l e s ?
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What are Black Holes?
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B B l l a c c k h o l l e s s a r r e t t h e r r e m n a n t t s s o f f m a s s s s i i v e s s t t a r r s s t t h a t t g o
Black holes are the remnants of massive stars that go
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Black holes are the remnants of massive stars that go
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t t h r r o u g h t t h e i i r r n u c c l l e a r r f f u e l l a n d t t h e n c c o l l l l a p s s e d u e t t o t t h e i i r r
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through their nuclear fuel and then collapse due to their
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through their nuclear fuel and then collapse due to their
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own gravitation. The resultant product is a singularity point t

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own gravitation. The resultant product is a singularity point
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of infinite density- along with an event horizon, the
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o o f f i i n f f i i n i i t t e d e n s s i i t t y - - a l l o n g w i i t t h a n e v e n t t h o r r i i z o n , , t t h e
of infinite density- along with an event horizon, the
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boundary beyond which absolutely everything, including
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boundary beyond which absolutely everything, including
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ll light, cannot return. They range in size from stellar-mass
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light, cannot return. They range in size from stellar-mass
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b b l l a c c k h o l l e s s , , p r r o d u c c e d b y t t h e c c o l l l l a p s s e o f f i i n d i i v i i d u a l l s s t t a r r s s , , t t o
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black holes, produced by the collapse of individual stars, to
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black holes, produced by the collapse of individual stars, to
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supermassive black holes found at the centers of galaxies.
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s s u p e r r m a s s s s i i v e b l l a c c k h o l l e s s f f o u n d a t t t t h e c c e n t t e r r s s o f f g a l l a x i i e s s . .
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supermassive black holes found at the centers of galaxies.
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T T h e S i n g u l l a r i i t y a n d E v e n t
The Singularity and Event
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The Singularity and Event
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Horizon
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Horizon
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The singularity is the centre of a black hole
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The singularity is the centre of a black hole
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T T h e s i i n g u l l a r i i t t y i i s t t h e c e n t t r e o f f a b l l a c k h o l l e
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w w h e r e t t h e c o l l l l a p s e o f f t t h e p h y s i i c a l l l l a w s o f f t t o d a y
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where the collapse of the physical laws of today
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where the collapse of the physical laws of today
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is enveloped by the event horizon. The event

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horizon is merely an imaginary boundary
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horizon is merely an imaginary boundary
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h h o r i i z o n i i s m e r e l l y a n i i m a g i i n a r y b o u n d a r y
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beyond which the escape velocity is larger than
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b b e y o n d w h i i c h t t h e e s c a p e v e l l o c i i t t y i i s l l a r g e r t t h a n
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beyond which the escape velocity is larger than
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that of light. It is not a physical surface but a
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t t h a t t o f f l l i i g h t t . . I I t t i i s n o t t a p h y s i i c a l l s u r f f a c e b u t t a
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that of light. It is not a physical surface but a
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point of no return, and it marks the limit of that
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point of no return, and it marks the limit of that
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p p o i i n t t o f f n o r e t t u r n , , a n d i i t t m a r k s t t h e l l i i m i i t t o f f t t h a t t
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r r e g i i o n f f r o m w h i i c h w e a r e a b l l e t t o s e e . .
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region from which we are able to see.
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region from which we are able to see.
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